A COURTIN’: After a contentious breakup, Golding pleaded guilty to stalking charges and was given probation in Jersey court (above). Photo: The Star-Ledger

A COURTIN’: After a contentious breakup, Golding pleaded guilty to stalking charges and was given probation in Jersey court (above). (The Star-Ledger)

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A powerful New Jersey Democrat who’s being touted as the party’s next state chairman has an insatiable lust for bondage, oral sex and spanking, secret e-mails obtained by The Post reveal.

Assemblyman Joe Cryan, of Union, graphically spelled out his kinky proclivities in more than 150 e-mails that he sent to a lobbyist — and then fought to keep them hidden after he stunned the state political world by having her busted for stalking in 2006.

After her arrest, Karen Golding said that they were intimately involved — and that she had the e-mails to prove it. Cryan has denied the relationship.

Cryan urged prosecutors for years to keep the courts from releasing the e-mails’ sexually charged content, while Golding pushed to get them out, first referring to them in court papers in 2009.

With the case still playing out in court, the secret correspondence — racy enough to make any “Fifty Shades of Grey’’ fan blush — landed on the driveway of a Post reporter.

“What do you want to be spanked with?” the lascivious lawmaker asked Golding in an inappropriate workday exchange that spanned 14 hours on June 28, 2004.

The e-mails were written when the pol presumably would have been at one of his government jobs — either his $49,000-a-year Assembly gig or his $111,000-a-year post as Union County undersheriff.

In recent weeks, Cryan — who was Democratic Party chair from 2009 to 2010 — has emerged as a contender to return to the chairmanship as the party gears up to take on Gov. Chris Christie at the voting booths in November.

In one e-mail, Cryan peppered his partner with questions.

“Tell me about your preference . . . knees . . . stairs?” On all fours as I stand?” he asked on June 11, 2004.

“Or hands tied to a bedpost as you stand? Dressed appropriately, of course.”

Cryan, who was vice chairman of the state Democratic Party at the time, dispatched most of his missives to Golding’s personal inbox from the AOL e-mail account listed on his official Assembly candidacy biography.

Cryan also traded other e-mails with Golding from his state government account and the account assigned to him by the Union County Sheriff’s Office, the documents show.

In their exchanges, Cryan admitted he was mixing business with pleasure.

On a Sunday in January 2004, Cryan sent more than a dozen e-mails to Golding, saying he was working at his legislative office in suburban Elizabeth.

He sent her a draft of a bill, the Financing Fairness Act, from his government e-mail around noon, asking, “What do you think? Appreciate it if you respond on the aol account.”

A few minutes later, from the AOL account, Cryan wrote:

“I’m having this great fantasy about you coming into this office, bending you over the desk.”

He then e-mailed the address of the office — which he shares with state Sen. Ray Lesniak — noting, “Surprise visits are always nice.”

Cryan frequently suggested they hook up for “blow and go” sessions.

Cryan, at various points, grew nervous about the paper trail he’d created.

“You delete these e-mails, right?” he asked July 21, 2004, as he cyber-fantasized about Golding dressing up like a hooker to surprise him the next week at the Democratic National Convention in Boston.

Golding later started harassing him and two women he dated, prosecutors said in a criminal complaint.

The case burst into the headlines as Cryan unleashed at least 20 officers, a special-prosecutions unit, intelligence unit and high-tech task force to bring Golding in on stalking charges in February 2006 after she let herself into his unlocked car in a Trenton Statehouse garage and left a note.

Golding subsequently pleaded guilty to stalking one of the women as part of a deal to keep her record clean and said her behavior was sparked by the breakup of a two-year affair with Cryan.

Last month, she filed the e-mails in Morristown Superior Court in a motion to reduce her sentence of two years’ probation, 90 days on a sheriff’s labor program and $155 in penalties.

“Even if she had some type of past relationship with Mister Cryan when they were both single consenting adults,” he said, “that would in no way justify her terrorizing the numerous other victims in this case.”

Golding declined comment.

NJ Assemblyman Joe Cryan has been trying for years to keep secret the emails between himself and Karen Golding, who was a politically connected lobbyist. On Feb. 5, Golding filed a motion in Morristown Superior Court in New Jersey with nearly 300 pages of those emails attached as exhibits. The Post obtained a copy of the motion and attachments and presents them here. The Post has blacked out email addresses, home addresses and telephone numbers.